CRASH LENS - Crash Analysis Tool

What is a Hot Spot? A hot spot is a location with more crashes than expected. Use this tool to identify roads and intersections that may need safety improvements. Sort by EPDO Score to prioritize locations with more severe crashes.

Segment Crash Rate Analysis: Compares each road segment's crash rate (crashes/mile) against the average for its FHWA functional class. Segments with Rate Ratio >1.5 are flagged as over-represented per FHWA guidelines. Segments <0.25 miles are excluded.

Category	Total	K	A	KA%	% of Total	Baseline	Difference
No data available

Speed crashes are X times more likely to result in a fatality compared to non-speed crashes.

What is a Before & After Study? A Before & After study evaluates the effectiveness of a safety treatment (countermeasure) by comparing crash data before and after implementation. This tool calculates crash reduction factors, statistical significance, and helps document project effectiveness for HSIP reporting.

Empirical Bayes (EB) Method: This method accounts for regression-to-mean bias by using reference group data to establish expected crash frequency. It's the preferred method for HSIP documentation and provides more accurate effectiveness estimates.

What are Countermeasures? Countermeasures are proven safety improvements (like adding signals, improving signs, or changing road design) that can reduce crashes. Each has a CMF (Crash Modification Factor) - a number showing how effective it is. A CMF of 0.70 means a 30% reduction in crashes.

Low crash sample size may affect recommendation reliability.

	Rank	Type	Location	Crashes	K	A	EPDO	VRU	Patterns	Score	Best Match	Actions
📍 No Data Loaded Upload crash data to see grant-ready locations

Project	Grant	Location	Amount	Deadline	Status	Actions
📋 No Applications Yet Click "New Application" to start tracking your grant applications

What can the AI do? Ask crash analysis questions like "What are the main crash patterns?" or MUTCD questions like "Does this location meet signal warrants?" or "What are the crosswalk marking requirements?" You can also upload photos for visual safety analysis.

Analysis period does not meet standard requirements.

No location selected. Select a location from the map or location dropdown above to auto-populate crash data.

Criteria	Required	Your Data	Status
Select a location to see analysis

Route	Count	K+A	EPDO	Actions
Select a category above to view locations

PSAP Crash Cluster Detected: This location has elevated pedestrian crash history. Criterion E should be checked.

ALL safety screening requirements must be met before proceeding. If any fails, a crosswalk SHALL NOT be installed.

Installation Decision:
• SHALL install if all 5 criteria met OR 20+ pedestrians/hour
• SHOULD install if 3 or more criteria met
• MAY install if 1 or 2 criteria met

Warrant Logic: Multi-way stop is warranted if Criterion A is met, OR Criterion B is met, OR (C.1 AND C.2 AND C.3) are all met, OR Criterion D (80% combined) is met.

Criterion C.3 requires average delay ≥30 seconds per vehicle on minor street during the highest hour.

Use HCS TWSC module with traffic counts above to calculate minor street control delay.

Crash Type	Count	Susceptible?
Right-Angle / Angle	0	✓ Yes
Left-Turn	0	✓ Yes
Right-Turn	0	✓ Yes
Total Susceptible	0
All Crashes (12 mo)	0	Reference only

Criterion	Description	Threshold	Actual	Result
A	Interim Measure	Signal pending	No	--
B	Crash Experience	≥5 in 12 mo	0	--
C.1	Major Street Volume	≥300 vph × 8 hrs	0 hrs	--
C.2	Minor Street Volume	≥200 vph × 8 hrs	0 hrs	--
C.3	Minor Street Delay	≥30 seconds	--	--
LOS	Minor Street Level of Service	Per HCM (TWSC)	--	--
D	Combined 80%	B+C.1+C.2 @ 80%	--	--

SIDRA Capacity Thresholds: V/C ≤ 0.85 (good), 0.85-0.95 (acceptable), >0.95 (over capacity)
Roundabout Types: Mini (<90ft ICD), Single-lane (90-150ft), Multi-lane (150-220ft)

NCHRP 888 CMFs: Angle crashes reduced 70-90%, head-on crashes reduced ~80%, injury crashes reduced 75-82%. Bicycle crashes may increase - consider enhanced bike facilities.

1. Peak Hour Volume:	--
2. ÷ K-Factor (Suburban):	÷ 0.093
= Base AADT:	--
3. ÷ DOW Factor (Tue-Thu):	÷ 1.00
4. ÷ Seasonal Factor (Average):	÷ 1.00
= Current AADT:	--
5. × Growth Factor (+20 yrs):	× 1.22
= Design Year AADT:	--

Approach	AADT	Peak Hr Vol	Left %	Thru %	Right %	HV %
Northbound
Southbound
Eastbound
Westbound

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🎯 Drawing Selection

📊 Selection Analysis

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How to select an area:

🎯 Crash Tree Analysis FHWA Systemic Safety

No Crash Data Loaded

Select Coordinate Columns

⚠️ Coordinates Outside Virginia

🌐 Configure ArcGIS Layer

🛑 Stop & Yield

🚗 Speed Limits

↩️ Turn & Movement

🅿️ Parking

🚦 Signals

↪️ Curves

✚ Intersections

⚠️ Advance

🔀 Lanes & Road

🚶 Crossings

📋 Supplemental

🛣️ Routes

📍 Destination

🏥 Services

🚦 Signals

🛡️ Safety

🔧 Utilities

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📂 Import

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Crash Analysis Report

Executive Summary

Table of Contents

🎨 Infographic Editor

📑 Comprehensive Quarterly Report

Report Preview

📋 Table of Contents

Before & After Safety Study Report

🎯 Primary Crash Types

🧩 Contributing Factors

📊 Detailed Crash Analysis

🤖 AI Countermeasure Assistant

🛣️ Road Geometry

🚶 Pedestrian Infrastructure

🚦 Traffic Control

🏢 Context

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📊 Combined Selection Analysis

No Data Loaded

🔍 AI Grant Search Assistant

🤖 Grant Writing AI Assistant

💲 Crash Cost Values (for B/C Calculation)

📋 Application Details

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Application Preview

Warrant 7: Crash Experience (MUTCD Section 4C.08)

🚦 Traffic Safety & MUTCD AI Assistant

📚 Domain Knowledge Assistant

🎯 Crash Types

🧩 Contributing Factors

Subcategory Breakdown

Collision Type Distribution

Roadway Description Breakdown

First Harmful Event Breakdown

Year Over Year Crash Distribution

🛣️ Curves + 🛡️ Guardrail

🛣️ Curves + No Guardrail + K/A

🏫 School Zone + 🧑 Young Driver

🚧 Work Zone + 🌙 Night

👴 Senior + 🛣️ Curves

🏫 School Zone + 🚶 Pedestrian

🛤️ Road Departure + 🛣️ Curves

🛤️ Road Departure + ⚡ Speed

🛤️ Road Departure + 🌙 Night

🚛 Large Truck + 🚦 Intersection